This tutorial will show you how to upgrade your iPhone 4 to iOS 4.3.1
without upgrading its baseband using TinyUmbrella for Windows.
Currently there is an issue with older basebands such as 1.59.00 and FW
4.3.1. Until ultrasn0w is updated, you will only see one bar under
Please Note: This ONLY Works with the iPhone 4!
Download TinyUmbrella from here
Also make sure to download the iPhone 4 iOS 4.3.1 which you can find here
Double click the downloaded TinyUmbrella.exe file.
If you get a Windows Firewall notification, check both boxes and click Allow Access.
Make sure the device is connected, and Umbrella has detected the type of device and its firmware.
**If you haven't already saved your iOS 4.3.1 SHSH blobs then click Save SHSH
. Make sure they successfully save before continuing.
Hit Start TSS Server
and make sure you receive no errors.
Once The TSS Server is "running" successfully, umbrella will kill
iTunes. Leave TinyUmbrella Open. You can double check to see if the TSS
server is running under the Log
If you do receive an error, DO NOT continue. Your restore will not work if the TSS server cannot be started.
Open iTunes by doubling clicking its icon.
Hold down the Shift
key and click Restore
Select your iPhone 4.3.1 firmware file from the popup window that appears and click Open
to begin restoring your device.
iTunes should give you error 1013. This is what we wanted, as it notes the baseband has not updated :) Click Ok
and close iTunes.
If you get a 16XX error then try entering DFU and go to step 5.
If your restore does NOT end in a 1013, it means your baseband was
updated. This is likely because you did not have the TSS server running
OR you updated without TinyUmbrella OR you are working with a device
OTHER than iPhone 4.
Place your iPhone into DFU mode by holding down both the Power and Home
buttons for ten seconds, then release the Power button and continue
holding the Home button for another 5 seconds. You can find help with
DFU mode here
Fix Recovery in TinyUmbrella is currently not working. Download this
standalone .exe file to fix recovery on 4.3.1. Extract the file and double click on fixrecovery43.exe
A command prompt will open, and the program will go through the
process. During this time, you will notice scrolling text on your iPhone
Your iPhone will now be on 4.3.1 with the 1.59.00 baseband! (Which means you can now unlock using this tutorial)
**Thanks to semaphore for his work on this tool